It's based on the anime of the same name. If you like giant robots and angst, you'll like Eva.
Great Book!! I read it all in one sitting.
If you are familiar with the anime series of the same name, you'll like this book. Volume 1 I would say covers episodes 1-3 (I think, haven't seen the anime in quite sometime) of the anime. Supposedly the manga takes on a twist of its own from the anime, so if you're into the world of Eva this might be for you.